Bag



Feb. 6, 1923.

C. H. HARTMAN ET AL.

BAGx

FILED FEB. 5, 1921.

[727267Z 0r/5' awZ jf Har 771/032 FcZe 2m er' J. @y W Patented Feb. T923.

KNMTED STATES CARL H. HARTMAN, OF TOLEDO, OHIO, AND ADELMER M. BATES, OF CHICAGO, ILLINOIS.

PATENT @RWCEO BAG.'

Application filed February 5', 1921. Serial No. 442,602.

To all whom t may concern.'

Be it known that we, .CARLII HARTMAN' and ADELMER M BATES, citizens of the United States, residing respectively at Toledo, in the county of Lucas and State of Ohio, and Chicago. in t-he county of Cook and State of Illinois, have invented a certain new and useful Improvement in Bags, of which the following is a specification.

Uur invention relates to valve bags, particularly such as are made of paper stock, and particularly such as are of considerable size and intended to take relatively heavy weights or large quantities of material. The increased cost of cotton and other cloth bags for cement, lime, plaster of Paris and the like has made it specially desirable to use paper bags, but for such weightymaterials the bags must be very strong. Paper bags strong enough for the work can be made of hemp or similar fabric, but of whatever material made, if strong enough for the work they must certainly be made of material which is very strong and heavy. With such material it is necessary to have a relatively long valve. It is also highly desirable with such materialto havethe edges or lips of the valves flexible. It is also difficult with such material and particularly with the form of bag hereinafter explained to um or glue the parts properly together.

ur invention has to do with solving these and other problems. It is illustrated in the accompanyingdrawings wherein:

Fig. 1 is a View of abag tube portion cut so as to include our invention;

Fig. 2 is a view of the tube portion of Fig. l, with the ends open.

Fig. 3 is a view of the same with one valve and iap shut.

Fig. 4 is a View of the same with both Valve end iiaps shut.

Fig. 5 is a cross section through the lines 5 5 of Fig. 4.

Fig. 6 is a plan view of the tube from which the bag is cut.

Like parts are indicated by like letters in all the accompanying drawings.

A is a portion of a tube formed preferably of-heavy stiff paper such portion being cut from t-he full length tube which may be of any desired length. At the valve end of the tube portion there is an indentation indicated at B, the material there cut from the fold being an extension B at the other end or closed end of the bag.

Referring to the valve end of this tube portlon, one flap may be indicated by the letter C and the ,other by the letter D, and the extensions by the letters E, E. These extensions are formed from the tube material at the sides 0f the indentation and they are preferably perforated as indicated at FF. The edges are slotted as at GG.

In the process of assembling or uniting the several portions of the bag at the bag end. the triangular portion J is collapsed against the body of the tube portion as indicated in Fig. Q. The gum or paste is now applied along the fold portion C as at K, and on the surfaces of the triangular por tion Jand the extension E, and on that portion of the extension E which is adjacent to the end of the fold portion C. The Hap D is turned down upon that portion of the bag end which lies between the line D and the line C which in turn marks the foldlng line for the fold C, and the parts will be in the position indicated in Fig. 3. Obviously the paste will take effect 'and close thel bag at the point where the triangle J and the extension E are found. and where the valve is not to be formed, but since there is no paste on the triangle J or that portion of the extension between the line C and the edge of the flap D, the paste will `not take effect and the valve end and the valve space will be left open.

If -now the fold/C be turned over on its line of fold in the position shown in Fig. 4, the paste on this portion and on the extensions at its two ends will take'etlect and the bag end will be closed with the valve left in position open ready for use.

This will complete the formation of the valve end of the bag. At the other end the parts may be folded in any desired manner though naturallythey would be collapsed and pasted in the usual way.

By having the indentation B no bag material is wasted and we can get from a given strip the same number of bags whether made by this method or the old method with the short valve lips. The indent-ation produces the valve extensions and they can be made of any desired length, The normal length of the valve would be the length given by the triangular strip J Without its extension E, and this is quite sufficient in the case of flexible, soft and yielding materials, but With stiff, heavy and relatively unyielding materials, such as very stiff and heavy paper, this length .is insufficient.

Whatever the length of the valve if the material be stiff there is a tendency for the lips to bend and permit,` material to pass even when noty desired and this tendency is greatly reduced by the relatively flexible end or edge of the lips. This flexibility is imparted to these/lips by slitting or slotting them, and this can be done at the time when the bag is out from the blank so as to necessiate no extra work, trouble or expense.

This feature of our invention could be applied to anylsize of bag or form of lip. but it is particularly important in the case of bags made from heavy paper, In order to insure the effective working of the paste. partielllarly in thc case of 'valve bags of the kind here shown and with the material under discussion. we find it highly desirable. to perforate the material so as to let the paste pass through.

By making the bags according to the process here set forth we avoid the expense and trouble of pasting the extension lip in the bag portion` and without wasting either time, money, labor or expensive bag material. The slitting. slotting, fraying or cutting of the edge of the valve material along the'lips will reduce to a minimum the tendency of the otherwise rigid lip to leave an opening through which the material may flow, although the applying of the paste through the perforations in the material tends, and this is particularly important in the case of heavy and thick material like that under discussion. to securely make the several folds. and thus produce a properly closed valve end.

ln Figure (i is shown the continuous tube of paper with the line of demarkation shown between one of the bag sections and the ballance of the tube.

We claim:

1. A valve bag formed from a blank having an indention in the middle of the valve end. said blank being folded and pasted to provide a valve lip extension.

2. A valve bag formed from a bag blank of heavy stiff'stock the end of the blank being cut and folded to form a valve lip extension. the edge of said valve being slit.V

3. The process of Inaking valve bags from heavy stock, which consists in cutt-ingvthe valve ends solas to form the valve, perforating its fold member, and applying the paste so that it will pass through the 'perforations and paste between the folds.

4. A valve bag of heavy paper-like stock comprising a valve bag blank 'with extension valve lips integral with the valve members.

5. valve bag of` heavy paper-like stock comprising a valve bag blank with extension valve lips integral with the. valve members, said lips frayed or slitted so as to be flexible.

(5. A valve bag of heavy paper-like stock comprising a valve bag blank with extension valve lips integral with the valve members, said extensions perforated to permit the paste to pass through them.

T. A valve bag made from heavy stiff stock the blank from which said bag is formed being' treated at the valve edge to give it flexibility.

8. A valve bag made from heavy stiff stock the blank .from which said bag is formed being slit at the valve edge to give it flexibility.

9. The process of making valve bags from heavy stock which consists in cutting the valve ends so as to form the valve, perforating its fold members, applying paste so that it will pass through the perforations, and paste between the folds, and treating the valve edge to make it flexible.

1().,The process of making valve bags from a continuous tubeI which consists in flattening the tube. in cutting the blank with an indentation in the middle of the valve end and folding and pasting the parts so as to provide al valve lip extension.

Signed at Chicago, Illinois this nineteenth day of January 1921.

CARL H. HARTMAN. ADELMER M. BATES. ll'itnesses A. (l. Co'rY, Il. B. LANUM. 

